• Boric Acid solution 1% for volumetric analysis 282972
• Boric Acid solution 2 % for volumetric analysis 287096
• Boric Acid solution 4% for volumetric analysis 282222
• Indicator Tashiro 4.4. Mixed (Methyl Red-Methylene Blue) for volumetric analysis 282430
• Kjeldahl Catalyst (Cu-Se) (1.5% CuSO4.5H2O + 2% Se) tablets 172926
• Kjeldahl Catalyst (Cu-Se) (9% CuSO4.5H2O + 0.9% Se) tablets 175570
• Kjeldahl Catalyst (Cu-TiO2) tablets 173349
• Kjeldahl Catalyst (Cu) (0,4% en CuSO4.5H2O) tablets 177010
• Kjeldahl Catalyst (Cu) (0.3% in CuSO4.5H2O) tablets 173350
• Kjeldahl Catalyst (Cu) (10,26% in CuSO4.5H2O) tablets 177040
• Kjeldahl Catalyst (Cu) (6.25% in CuSO4.5H2O) tablets 174428
• Kjeldahl Catalyst (Cu) (9% in CuSO4.5H2O) tablets 175639
• Kjeldahl Catalyst (Se) tablets 173348
• Kjeldahl tablets (Catalyst with 4.95 g K2SO4 and 0.05 g Se)177768
• Sodium Hydroxide solution 32% w/v for the determination of nitrogen 122666